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参数资料
| 型号： | P87C42 |
| 厂商： | INTEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | UNIVERSAL PERIPHERAL INTERFACE CHMOS 8-BIT SLAVE MICROCONTROLLER |
| 中文描述： | 8-BIT, OTPROM, 12.5 MHz, MICROCONTROLLER, PDIP40 |
| 封装： | PLASTIC, DIP-40 |
| 文件页数： | 5/25页 |
| 文件大小： | 345K |
| 代理商： | P87C42 |
UPI-C42/UPI-L42
UPI-42 COMPATIBLE FEATURES
1.
Two Data Bus Buffers, one for input and one for
output. This allows a much cleaner Master/Slave
protocol.
290414–5
2.
8 Bits of Status
ST
7
ST
6
ST
5
ST
4
F
1
F
0
IBF OBF
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
ST
4
–ST
7
are user definable status bits. These
bits are defined by the ‘‘MOV STS, A’’ single
byte, single cycle instruction. Bits 4–7 of the
acccumulator are moved to bits 4–7 of the status
register. Bits 0–3 of the status register are not
affected.
MOV STS, A
Op Code: 90H
1
0
0
1
0
0
0
0
D
7
D
0
3.
RD and WR are edge triggered. IBF, OBF, F
1
and
INT change internally after the trailing edge of RD
or WR.
During the time that the host CPU is reading the
status register, the UPI is prevented from updat-
ing this register or is ‘locked out.’
290414–6
4.
P
24
and P
25
are port pins or Buffer Flag pins
which can be used to interrupt a master proces-
sor. These pins default to port pins on Reset.
If the ‘‘EN FLAGS’’ instruction has been execut-
ed, P
24
becomes the OBF (Output Buffer Full)
pin. A ‘‘1’’ written to P
24
enables the OBF pin (the
pin outputs the OBF Status Bit). A ‘‘0’’ written to
P
24
disables the OBF pin (the pin remains low).
This pin can be used to indicate that valid data is
available from the UPI (in Output Data Bus Buff-
er).
If ‘‘EN FLAGS’’ has been executed, P
25
be-
comes the IBF (Input Buffer Full) pin. A ‘‘1’’ writ-
ten to P
25
enables the IBF pin (the pin outputs
the inverse of the IBF Status Bit. A ‘‘0’’ written to
P
25
disables the IBF pin (the pin remains low).
This pin can be used to indicate that the UPI is
ready for data.
Data Bus Buffer Interrupt Capability
290414–7
EN FLAGS
Op Code: 0F5H
1
1
1
1
0
1
0
1
D
7
D
0
5.
P
26
and P
27
are port pins or DMA handshake
pins for use with a DMA controller. These pins
default to port pins on Reset.
If the ‘‘EN DMA’’ instruction has been executed,
P
26
becomes the DRQ (DMA Request) pin. A ‘‘1’’
written to P
26
causes a DMA request (DRQ is
activated). DRQ is deactivated by DACK
#
RD,
DACK
#
WR, or execution of the ‘‘EN DMA’’ in-
struction.
DMA Handshake Capability
290414–8
5
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